package org.apache.archiva.metadata.repository;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.concurrent.atomic.AtomicBoolean;

/**
 * Implements just the open/close methods in a concurrent safe manner.
 */
public abstract class AbstractRepositorySessionFactory implements RepositorySessionFactory {

    AtomicBoolean open = new AtomicBoolean();

    protected abstract void initialize();

    protected abstract void shutdown();

    @Override
    public void open() {
        if (open.compareAndSet(false,true)) {
            initialize();
        }
    }

    @Override
    public boolean isOpen() {
        return open.get();
    }

    @Override
    public void close() {
        if(open.compareAndSet(true,false)) {
            shutdown();
        }
    }
}
